Individual call device for telephones



(No Model.)

0. H. VINUENT. INDIVIDUAL CALL DEVICE FOR TELBPHONES.

Patented July 1, 1890.

ooO o n4: NORRIS Pawns 120., wow-2mm, wnsumman, a. c.

UNITED STATES PATENT OFFICE...

CHARLES II. VINCENT, OF LYNN, MASSACHUSETTS, ASSIGNOR TO FREDERICK WV.A. BERGENGREN, OF SAME PLACE, AND JOHN V. SPALDING, OF BOS- TON,MASSACHUSETTS.

INDIVIDUAL CALL DEVICE FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 431,088, dated July 1,1890.

Application filed August 2, 1889. Serial No. 319,549. (No model.)

To all whom, it may concern: B, meshing in the teeth of the wheel B,hav- Be it known that I, CHARLES H. VINCENT, ing a crank B as is usualin magneto genera citizen of the United States, and a resident ators. Byturning the crank B the armature of Lynn, in the county of Essex andState of B is set in a quick rotary motion, as usual; or

5 Massachusetts, have invented new and useful said armature may berotated by power ap- Improvements in Individual Call Devices for pliedto its shaft in any other suit-able or Telephones, of which thefollowing, taken in equivalent manner without departing from connectionwith the accompanying drawings, the essence of my invention. isspecification. In the drawings I have represented the To This inventionrelates to improvements in magneto-generator as connected to fiveindicall devices for telephones, and it has for its vidual call-bells onas many telephones on object to enable the operator at the central theline; but more or less telephones may be station to ring up any one ofthe telephones thus connected. In practice I prefer to conou the line(in a block of from two to about nect ten telephones to the improvedmagneto- 15 ten) without ringing up the others, and this generator.

I do by means of a magneto-generator of va- B in Fig. 4 represents theshaft of the riab1e strength at the central office or exarmature, to oneend of which is attached a change and individual call-bells on thetelesleeve B of hard rubber or other suitable in: phones in the blocksystem, which bells are sulating material. Said insulated sleeve B 20actuated and sounded according to the is surrounded by a number of metalrings or strength of the magnetoelectrie current sent commutator-bandsb, b, b b and b, which through their respective electro-lnagnets, as areconnected to the respective coils of wires will hereinafter be morefully shown and de- C, 0'', C C and C on the armature B by scribed,reference being had to the accommeans of the wires 0, c, 0 c and as 2 5panying drawings, whereshown in Fig. 6.

Figure 1 represents a side. view of the mag- The coil C is connected tothe 0011 C" and neto-generator, partly shown in section, the wire 0 bymeans of the wire d. The coil commutator, and the key-board. Fig. 2 rep-C" is connected to the coil C and wire 0 by resents a verticalcross-section of the magmeans of the wire (1. The coil C is con- 0neto-generator. Fig. 3 represents a side elenected to the coil C andwire 0 by means of vation of one of the individual call-bells in thewire d. The coil C is connected to the So the block system. Fig. irepresents a longicoil C and wire 0 by means of the wire (1", tudinalsection of the commutator. Fig. 5 repand the coil C is connected bymeans of the resents a diagram showing the magneto-genwire (:1 tot-heground G, as shown in Fig. 6.

3 5 orator and individual call-bells in the block 6, e, 6 e, and .2represent metallic system connected together for operation; and brushes,the free ends of which are held in Fig. 6 represents a diagram showingthe commetallic contact with the respective commumutator and the coilsof the armature on the tator-rings I), Z)", 11 Z), and b and havingmagneto-generator. their rigid ends secured in a suitable manner 0Similar letters refer to similar parts when to the insulated bar orplate a, as shown in ever they occur on the different parts of theFig. 1. The brushes e, 6, e c, and e are drawings. connected,respectively, to the keys E, E,

a in Figs. 1, 2, and 5 represent the perma- E E and E by means of wires,as shown in nent horseshoe-magnets of the magneto-gen- Figs. 1 and 5.

45 orator at the central office or exchange, and E represents thekey-board, with which a a represent the field-magnets, as usual. eitherof the keys E, E, E E, or'E maybe 15 represents the rotary armature,having connected by depressing their ends, as is its shaft journaled insuitable bearings, and common in telephonic exchanges.

preferably provided in one end with a pinion From the key-board E leadsa wire F to the individual call-bells I, K, 1,11} and N on thetelephones in the block system, as shown in Fig. 5. The individual callI consists of the electro-magnet t' and its metal frame 1' To the freeend of thesaid frame t" is pivoted the arm t" and on an intermediatepiece sup-' ported on said arm is hinged the armature 6 as shown in Fig.3. The arm 0; is provided with a screw-threaded lever t, on which is adjustably secured the weight 1'" as shownin Figs. 3 and 5.

2' is a spring interposed between the electro-magnet i and arm 2' forthe purpose of holding the armature 45 away from the electro-magnet whenno current passes through the electro-magnet t, and t is a regulatingset-screw on the arm 2' for limiting the outward movement of thearmature-arm t".', as shown in Fig. 3.

i is an electrode secured in a suitable manner to the individualteleophone on which the bell-call is used, and t is the wire leadingfrom the electro-magnet 7 to the electrode i 1' is the wire leading fromthe e'lectromragnett'to the next individual magnet in the block system.

The wire F is connected to the coil of the electromagnet 2', and itsframe t" connected to said wire F by means of the wire W, as shown inFigs. 3 and 5.

I represents the clapper-lever secured to the armature 2' and 1represents the bell or bells, as is common in telephone-calls.

70'' K K" Z Z L L" m m" M h 'n n" N N" represent corresponding parts onthe respective individual bell-calls K, L, M, and N, as shown in Fig. 5.

n represents the wire leading from the electro-magnetn to the ground G,as shown in Fig. 5.

By adjusting the weights 2', 70 Z, m and n on the respectivecall-stations I, K, L, M, and N the armature-resistance on suchcallstations will be made according to the magneto-generating power ofthe respective coils O, C, 0 C and C, and consequently that one only ofthe bells in the line will be sounded that corresponds to the key on thekey-board that is depressed by the operator at the central otfice orexchange which corresponds to the coil on the revolving arrna= ture ofthe magneto-generator. Others in the circuit will not be operated owingto ab sence of power sufficient to attract the arma tures or to excessof power by which the arms 2' 7c are brought in contact with theelectrodes i 70 causing the current to be cut off from the correspondingeleetro-magnets, and

so on.

It will be understood that a current of electricity of differentintensity is employed to operate each call, and that the Weights on thelevers are adjusted to agree with the intensity of current necessary tooperate each call; or, in other words, a current of certain intensity isnecessary to operate call I, a current of different intensity operatescall K, and so on throughout the other calls, and thus but one call canbe operated at once, and each call is operated by a current of intensityto which the call is adjusted. Each call hasakey to eitect suchoperation, and each call is adjusted to suit the intensity of thecurrent necessary to operate it.

What I wish to secure by Letters Patent, and claim, is-

1. In an individual call system, the combination of the electro-magnet,the armature, hammer, and bell, the arm to which the armature isconnected, the electrode or contact which co-operates with the said arm,and the weighted lever connected to said arm, sub stantially asdescribed.

2. In an individual call system, the combination of themagneto-generator, the commutator, the keys, the electro-magnets, thearmatures, the arms to which said armatures are connected, the leversconnected to said arms, the weights adjustable on said levers, and theelectrodes adjacent to said arms, substantially as described.

In testimony whereof I have signed. my name to this specification,in thepresence of two subscribing witnesses, on this 24th day of July, A. D.1889.

CHARLES H. VINCENT.

Witnesses:

GEO. W. WHITE, MARTHA J. JACKSON.

